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I've tried the 温泉卵 onsen tamago(https://en.wikipedia.org/wiki/Onsen_tamago). The one I had was kind of over cooked and had a sulfur taste. Wasn't great.

In Iceland they also use the hotsprings to cook bread: https://www.youtube.com/watch?v=vz-7iUw8Sl0

Well, whether your egg will have a sulphuric taste will depend on whether the onsen you went to had sulphuric water.

No, just cooking an egg for a long time at high temperatures will bring out the sulfur taste. Try boiling an egg for 15 minutes.

Oh, true, I hadn't thought about that.